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paper.go
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paper.go
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package tiling
type TiledPaper struct {
Width, Height float64
TileOffset Vector64
TileSize Size64
TileSpacing Vector64
}
func (p TiledPaper) createPositionGenerator() *positionGenerator {
return &positionGenerator{
paper: p,
}
}
type positionGenerator struct {
paper TiledPaper
position Vector64
valid bool
}
func (generator *positionGenerator) start() {
generator.position = generator.paper.TileOffset
generator.valid = true
}
func (generator *positionGenerator) advance() {
if !generator.valid {
return
}
nextX := generator.position.X + generator.paper.TileSize.Width + generator.paper.TileSpacing.X
nextY := generator.position.Y
if nextX > generator.paper.Width-generator.paper.TileSize.Width {
nextX = generator.paper.TileOffset.X
nextY = generator.position.Y + generator.paper.TileSize.Height + generator.paper.TileSpacing.Y
}
if nextY > generator.paper.Height-generator.paper.TileSize.Height {
generator.valid = false
}
generator.position.X = nextX
generator.position.Y = nextY
}
func (generator *positionGenerator) CurrentPosition() Vector64 {
return generator.position
}
func (generator *positionGenerator) IsCurrentPositionValid() bool {
return generator.valid
}